JPH11117849A - Air pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air pump that produces a stable quantity of air. SOLUTION: An air pump comprises a pump body 43 having a diaphragm 41, and a connecting lever 60 connected at its one end to the diaphragm 41 and at the other by way of an eccentric cam 57 to a shaft 56 coupled to a motor 44 for driving the lever 60, both of which body and lever are held in housing pieces 45a, 45b and 45c formed with intake ports 46a and 46b connecting with the air and exhaust ports 47a and 47b connecting to an ejector. The arrangement holds the reciprocating stroke of the diaphragm 41 constant continuously to stabilize the supply quantity of air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air pump for supplying air by a diaphragm.

[0002]

2. Description of the Related Art For example, Japanese Patent Laid-Open Publication No.
As shown in Japanese Patent No. 399, an air pump used in an oil supply device having an oil type determination function supplies air by vibrating an arm to which a diaphragm is fixed by magnetic force generated from a solenoid.

[0003]

However, the arm does not always move the same stroke, and the supply amount of air is not stable, so that sufficient scavenging and suctioning of the oil type sensor and the pipeline cannot be performed. There was a risk of erroneous determination. In addition, the diaphragm is 50-
Since it reciprocates about 60 times, there is an inconvenience that a load is applied and the diaphragm is damaged.

The present invention has been made in view of such a problem, and an object of the present invention is to provide an air pump in which the amount of supplied air is stabilized.

[0005]

In order to solve such a problem, the present invention provides an air inlet communicating with the atmosphere,
A pump body having a diaphragm provided in a housing having an exhaust port communicating with an ejector, a connecting rod having one end fixed to the diaphragm, and the other end of the connecting rod being an output shaft from a motor for driving the connecting rod. Are connected via an eccentric member, the stroke required for the reciprocation of the diaphragm is always constant, and the air supply amount is stabilized.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a configuration diagram showing an embodiment of an oil supply device using the air pump of the present invention, FIG. 2 is a pipeline diagram showing a flow channel configuration of the above device, FIG. 3 is a cross-sectional view showing an embodiment of the air pump of the present invention, FIG. 4 is a view showing one end of the connecting rod.

[0007] As shown in FIGS.
A fuel supply pump 4 in which a refueling motor 3 is connected to a refueling pipe 2 communicating with an underground tank and a flow meter 6 in which a flow rate pulse transmitter 5 is connected are sequentially disposed therein, and a sensor having a gas sensor 28 at the tip of the refueling pipe 2 A refueling mechanism including a refueling hose 9 having a refueling nozzle 8 provided with a chamber 7, a nozzle holder 11 having a nozzle switch 10 for accommodating the refueling nozzle 8, the nozzle switch 10 and a gas sensor 28.
Pump 12 and refueling motor 3 to be described later with a signal from
And a control device 14 that outputs a drive / stop signal to the display unit 13 and converts a pulse signal from the flow rate pulse transmitter 5 into an oil supply amount and outputs the same to the display 13. The control device 14
Has oil type data registered in advance, and the gas sensor 28
If the detection signal from the controller matches the registered oil type data, a drive signal is output to the refueling motor 3 to make refueling possible, and if not, an operation signal is output to the alarm 13 to make refueling impossible. Is done.

An air tube 21 for supplying air from the air pump 12 is communicated with the sensor chamber 7, and a switching valve 22 is provided in the air tube 21 in conjunction with an oil supply lever.

The switching valve 22 is urged by a spring and is movable by a diaphragm 23 which receives a hydraulic pressure at the time of refueling by a flow path, and has an operating rod 24 which is normally urged to one side by a spring. By the operation rod 24, the exhaust port 2 of the ejector 25 when passing through the position a in FIG.
6 and the air opening 27 are cut off, and the air tube 21 is cut off.
Is supplied to the sensor chamber 7, and at a position b in FIG. 2, the exhaust port 26 of the ejector 25 and the atmosphere opening port 2
7, and is configured to guide the negative pressure generated by the ejector 25 to the sensor chamber 7.

In the present embodiment, the sensor chamber 7 is formed as a cylindrical body having a constant propagation path length because of the measurement based on the propagation speed of the ultrasonic wave.
8 is connected to the negative pressure port of the ejector 25 at one end by a tube 29.
And a second opening 32 formed at the other end thereof with a tube 31 communicating with a vapor suction / scavenging port (not shown) at the tip of the cylinder.

Reference numeral 33 in the figure denotes the above-mentioned microswitch which activates the gas sensor 28 when the fueling lever is pulled up. When the fueling lever is pulled up and the magnetic material at the tip of the lever is opposed, a sensor from the control device 7 is provided. The drive pulse is supplied to the gas sensor 28, and an echo signal resulting from the drive pulse is output to the control device 7. The transmission of these signals is performed by a cable 34 that is inserted through the air tube 21 and extends from the fueling apparatus main body 1. The air tube 21 is extended along with the oil supply hose 9 connecting the flow meter 6 and the oil supply nozzle 8. Reference numerals 35 and 36 in the figure denote coupling means for inserting the cable 34 into the air tube 21 and separation means for pulling out the cable 34 from the air tube 21, respectively.

FIGS. 3 and 4 show an embodiment of the air pump 12 described above. A pump body 43 formed by a rubber diaphragm 41 and holding plates 42a and 42b is driven and stopped by the control device 7. Motor 4 operated by signal
The pump body 43 is configured to supply air by reciprocating the pump body 43 with the output from the housing 4, and the housings 45a, 45
b, 45c. Housing 45b,
45c has intake ports 46a and 46b and exhaust ports 47a and 47
b is opened, and the intake ports 46a and 46b and the exhaust port 4 are opened.
Valve bodies 48a and 48b are provided between the valve bodies 7a and 47b. An air inlet 50 provided with a filter 49 is attached to the intake port 46b, and the air tube 21 for feeding air is connected to the exhaust port 47b.

The rotational force from the motor 44 provided in the explosion-proof chamber 52 formed by the housings 51a and 51b is provided with a gear 54 at the tip of the output shaft 53 and a gear 55 at one end so as to mesh with the gear 54. The rotation of the motor 44 is transmitted to the formed shaft 56 at a reduced speed. An eccentric cam 57 is fixed to the other end of the shaft 56 as an eccentric member by a pin 58, and the eccentric cam 57 is rotatably attached to the other end of a connecting rod 60 having the pump body 43 attached to one end by a screw 59. Have been. The eccentric cam 57 is rotatably attached to a hole 61 at one end of the connecting rod 60 via a bearing 62, and the center of a shaft 56 that transmits the rotational force of the motor 44 is displaced from the center of the connecting rod 60. The connecting rod 60 is reciprocated by the rotation of the shaft 56. Reference numeral 63 in the figure
Is a balancer for preventing the shaft 60 from moving.
Reference numeral 64 in the figure denotes a fan for dissipating heat generated by the motor 44.

In the apparatus configured as described above, when the oil supply nozzle 8 is now removed from the nozzle holder 11, a nozzle removal signal is output from the nozzle switch 10 to the control device 14, and the control device 14 resets the display device 13. A signal is output, and an operation signal is output to a motor 44 that drives the air pump 12. As a result, the rotational force of the motor 44 is reduced by the gears 54 and 55, and the connecting rod 60 is converted into reciprocating motion via the eccentric cam 57 provided at the tip of the shaft 56, so that the pump body 43 reciprocates. Thereby, the intake port 46a, the valve body 48a,
Air is sucked through the intake port 46b, and the exhaust port 47a,
The compressed air is discharged to the air tube 21 from the valve body 48b and the exhaust port 47b. At this time, since the refueling lever is not pulled, the exhaust port 26 of the ejector 25 is closed by the switching valve 22, so that the air sent by the air tube 21 flows into the sensor chamber 7, where the vapor stagnates there. Is discharged to the outside through the vapor suction and scavenging port at the cylinder tip of the refueling nozzle 8. Further, since the pump body 43 directly receives the driving force from the motor 44 via the shaft 56 and the connecting rod 60, the moving distance is constant, the amount of air flowing into the sensor chamber 7 is stabilized, and sufficient scavenging is performed. Furthermore, since the rotation of the motor 44 is decelerated and the pump body 43 reciprocates about 12 times per second, the load on the diaphragm is reduced, and the durability is improved.

In this state, when the refueling nozzle 8 is inserted into the refueling port of the automobile and the refueling lever is pulled, the micro switch 33 is turned on.
Is turned on, the switching valve 22 moves to the position b, and the exhaust port 26 of the ejector 25 is opened to the atmosphere. As a result, a negative pressure is generated from the ejector 25, and vapor in the tank flows into the sensor chamber 7 from the vapor suction and scavenging port.

Upon receiving the ON signal from the micro switch 33, a drive pulse is supplied from the control device 14 to the gas sensor 28 in the sensor chamber 7, and the vapor concentration is measured based on the propagation time. A signal from the gas sensor 28 is taken into the control device 14 to determine the oil type. If the fuel in the vehicle fuel tank matches the oil type registered in the fueling device in advance, a drive signal is sent to the fueling motor 3. The fuel oil is supplied to the refueling nozzle 8 by output. Air pump 1
The output of the operation signal to the second motor 44 is stopped.

When a predetermined amount of refueling is completed and the refueling lever is lowered, and the refueling nozzle 8 is hooked on the nozzle hook 11,
An off signal is output from the nozzle switch 10, a drive stop signal is output to the refueling motor 3, and the supply of fuel oil is stopped. Due to the lowering of the fuel supply lever and the stop of fuel oil supply, the operating rod 24 moves to the position a by the urging force of the spring.

On the other hand, if the oil type determination result is not output even after a certain time has passed in the oil type determination, a warning is issued to inform that "return the nozzle to the nozzle hook and check the oil type". Is notified by the device 15. When the refueling nozzle 8 is returned to the nozzle hook 11 by this notification and an off signal is output from the nozzle switch 10, the operation of the alarm 15 is stopped.

In this embodiment, one oil supply nozzle has been described. However, if the pump body is set to a reciprocating movement distance and area according to the air supply amount, a plurality of oil supply nozzles can be provided by one air pump. It can correspond to a nozzle.

[0020]

As described in detail above, the air pump according to the present invention comprises a pump body having a diaphragm provided in a housing having an intake port communicating with the atmosphere and an exhaust port communicating with an ejector. The connecting rod having one end fixed to the diaphragm and the other end of the connecting rod are connected via an eccentric member to a shaft from a motor for driving the connecting rod, so that the stroke of reciprocation of the diaphragm is always constant. Therefore, the supply amount of air is stabilized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of an oil supply device using an air pump of the present invention.

FIG. 2 is a pipeline diagram showing a channel configuration of the above device.

FIG. 3 is a sectional view showing an embodiment of the air pump of the present invention.

FIG. 4 is a view showing one end of a connecting rod.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Refueling device main body 2 Refueling pipe 3 Refueling motor 4 Refueling pump 5 Flow rate pulse transmitter 6 Flowmeter 7 Sensor room 8 Refueling nozzle 9 Refueling hose 10 Nozzle switch 11 Nozzle hook 12 Air pump 13 Indicator 14 Control device 15 Alarm 21 Air tube Reference Signs List 22 switching valve 23 diaphragm 24 operating rod 25 ejector 26 exhaust port 27 atmosphere opening port 28 gas sensor 29 tube 30 opening 31 tube 32 opening 33 micro switch 34 cable 35 coupling means 36 separation means 41 diaphragm 42a, 42b pressing plate 43 pump body 44 motor 45a, 45b, 45c Housing 46a, 46b Intake port 47a, 47b Exhaust port 48a, 48b Valve element 49 Filter 50 Air intake 51a, 51b Housing 52 Explosion-proof room 53 Output shaft 5 4 Gear 55 Gear 56 Shaft 57 Eccentric cam 58 Pin 59 Screw 60 Connecting rod 61 Hole 62 Bearing 63 Balancer 64 Fan

Claims (1)

[Claims] 1. A pump body having a diaphragm provided in a housing having an intake port communicating with the atmosphere and an exhaust port communicating with an ejector, a connecting rod having one end fixed to the diaphragm, and the other end of the connecting rod. An air pump characterized in that a shaft from a motor driving a connecting rod is connected via an eccentric member.